Originally Posted by HarryT
I would guess that this is intended to cover the situation where, say, a husband and wife each have a Kindle, both registered to the same account (I know several couples who do this). In that case, they may well be reading the same book on each of the Kindles.
Sorry...either I can share the content by letting someone else use a Kindle registered to my account or I can't. The example you describe of a husband and wife sharing the account and content that is tied to that account is no different from my example of having an extra Kindle to loan to my mother or anyone else that I choose.